PODOSPHAEKA 31 



<P 



diag.) 1886; Sacc. Syll. Fung. 9: 364. 1S91. 



Juel. Ofvcrs. K. Oct. Akad. Forh. 



51 : 496. 1895. 



Exsicc: Bri. and Cav. Fung. par. 215 ; Rab.-Wint. Fung. Eur. 



3042, 3241, 3242, 3656; Syd. Myc. March. 1064, 1543, 2227, 



*3559; Rchm. Asconi. 798, 900; Rounieg. Fung. Gall. MksIcc. 



2735, 3736; Westend. Herb. Crypt. Belg. 2S0, 1057; and 740 



sub Erysiphc penicellata \2.x. inespili ; Fckl. Fung. Rhcn. 728, 729 ; 



Desmaz. PI. Cr. Fr. ed. i : ser. i : 919; and 1305 sub Erjsibe 



peniccllatavTur. incspili, *ser. 2 : 919, *cd. 2 : scr. i ; 219 ; and 705 



sub E. pcnicdlata var. vicspili ; Ell. and Everh. N. Am. Fung. 



55. 55t>, 2335; *E1I. and Everh. Fung. Columb. 107; *Sacc. 



Myc. Yen. 1374; *Seym. and Earle, Econ. Fung. 126, 130, 



132, 133, 418, 430; Lib. PL Cr. Ard. Ease. 3:278; Karst. 



Fung. Enun. Exsicc. 277 ; de Thiim. Fung. Austr. 440, 446 ; 



Rab. Fung. Eur. 566; *\Vartm. and Schenk, Schweiz. Krypt. 



628; *Gandog. Fl. Alger. Exsicc. 1984; *Erikss. Fung, par 



scand. 32, 135 ; *Krieg. Fung. Saxon. 72. 



Aniphigenous, mycelium variable, sometimes persistent in 

 thin patches, at others wholly evanescent ; perithecia scattered to 

 more or less densely gregarious in clinging masses, subglobose, 

 64-90 /-< in diameter, cells 10-18 //wide; appendages spreading, 

 more or less equatorially placed, occasionally springing from nearer 

 the apex, extremely variable in number and length, from 4-30 in 

 number, and from 3^-6, or rarely 10 times the diameter of the 



perithecium, usually unequal in length on the same perithecium, 

 septate, dark brown for more than half their length, usually nearly 

 to the apex, becoming thick -walled throughout, with the lumen 

 more or less obliterated, apex 2-4 times dichotomously branched, 

 branches usually short and equal ( sometimes slightly elongated ), 

 ultimate branches rounded, swollen, and more or less knob-shaped ; 

 ascus broadly obovate, broadly oblong, or subglobose, variable in 

 size, 58-90 X 45-75 /«; spores normally 8, very rarely 6, varia- 

 ble in size, 1 8-30 x 10-17 /^. 



Hosts.— Amdanchier Canadensis, Crataegus Azarolus (272), C. 

 cocdnca, C Cms-galli, C. Oxyacantha, C. rivularis, C. sanguinea 

 (350), C spathulata, C suhvillosa (269), C. tomcntosa and vars. 

 punctata d^nd pyrifolia, Diospyros Vvginiana (299), Prunns Ameri- 

 cana, P. avium, P. Besseyi, P. Cerasiis, P. Chicasa (3 24), P. de- 



